Model aerodinamike velikih napadnih kutova modernog lovačkog aviona

master's thesis

• Title (english): High-angle-of-attack aerodynamics model for modern fighter aircraft
• Author: Monika Valpovac
• Mentor: Milan Vrdoljak (mentor)
• Mentor: Marijan Andrić (komentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-05-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Aviation, Rocket and Space Technology; Aircraft Construction and Design

Abstract

U ovom diplomskom radu modeliran je slom uzgona u Simulink-u za avion IR-1 nalik na Dassault Rafale. Na temelju literature, odabrani su koeficijenti potrebni za opisivanje modela. Implementirani su koeficijenti uzgona, otpora, momenta propinjanja te bočni koeficijenti skretanja i valjanja za velike napadne kutove, od 10 do 60 stupnjeva. Proveden je eksperiment za analizu rezultata s pilotom u petlji. Postojeći model zrakoplova IR-1, nakon modifikacija uvedenih za slom uzgona analiziran je na simulatoru leta na uzorku od 10 ispitanika. Za potrebe eksperimenta, kandidati su dobili dva zadatka izvlačenja zrakoplova iz sloma uzgona. Prvi zadatak sastoji se od prilaska slomu uzgona te neposredno nakon dolaska u slom uzgona, odnosno trenutka u kojem napadni kut dođe do 25 stupnjeva, izvlačenje iz ekstremne situacije. Sljedeći zadatak je ponovno približavanje slomu uzgona te nakon ulaska u duboki slom uzgona za što se smatra situacija u kojoj je napadni kut već prešao iznos od 30 stupnjeva, slijedi izvlačenje aviona iz sloma uzgona. Svaki od kandidata je ispunio NASA – Task Load Index upitnik i ocijenio upravljivost modela po Cooper-Harper ljestvici za oba zadatka. Nakon eksperimenata provedena je subjektivna i objektivna analiza rezultata. Analize rezultata uključuju i provjeru zaključaka dobivenih iz analize ravnotežnog leta i analize valjanja zrakoplova za rezultate dobivene proračunom.

Abstract (english)

In this thesis, stall was modeled in Simulink for IR-1, aircraft similar to the Dassault Rafale. Based on already obtained data, coefficients nedeed for creating the model were chosen. The lift coefficients, drag coefficients and pitch moment coefficients among with lateral coefficients for roll and yaw, are implemented in the Simulink model for high angles of attack, from 10 to 60 degrees. After collecting the data and modifying the model, an experiment was conducted with a pilot in the loop. The existing IR-1 aircraft model, was analyzed on a flight simulator on a sample of ten subjects. For the purposes of the experiment, candidates were given two tasks of saving the aircraft from stall conditions. The first task consists of approaching the stall and immediately after the signal, i.e. the moment when the angle of attack reaches 25 degrees, getting out of the extreme situation. The following task is to approach to deep stall conditions, and right after the angle of attack has reached 30 degrees, retract the aircraft. Each of the candidates completed the NASA Task Load Indeks questionnaire and rated the manouverability of the model according to the Cooper-Harper scale for both tasks. After the experiments, a subjective and objective naalysis of the results as carried out. The analysis of the results includes the verification of the conclusions obtained from the trim flight analysis and the analysis of lateral aerodynamics from the calculations done before experiments.

• Keywords: slom uzgona; borbeni zrakoplov; simulator leta; veliki napadni kutovi; analiza ravnotežnog leta; bočna aerodinamika
• Keywords (english): stall; fighter aircraft; flight simulator; high angles of attack; trim analysis; lateral aerodynamics
• Language: croatian
• URN:NBN: urn:nbn:hr:235:609887
• Study programme: Title: Aeronautical Studies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka zrakoplovnog inženjerstva (magistar/magistra inženjer/inženjerka zrakoplovnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2026-05-14
• Created on: 2024-05-17 10:57:40